第18卷第2期Vol.18No.2草地学报ACTAAGRESTIASINICA2010年3月Mar.2010重庆红池坝地区草地群落生物量及物种丰富度沿海拔梯度格局变化宋璐璐1,2,樊江文13,钟华平1,王宁1,2(1.中国科学院地理科学与资源研究所,北京100101;2.中国科学院研究生院,北京100049摘要:以重庆红池坝地区草地群落为研究对象,沿海拔梯度设置了14个样地,利用收获法和土钻法分别测定地上生物量和地下生物量,同时记录各样方内的物种数,研究了群落生物量及物种丰富度沿海拔梯度的变化特征。结果表明:草地群落地上生物量沿海拔梯度呈降低趋势,地下生物量和根冠比呈增加趋势;禾本科与杂类草植物的地上生物量与海拔梯度呈显著负相关(P<0.05,菊科植物地上生物量与海拔梯度相关性较小;物种丰富度与海拔梯度呈负相关关系,分布格局呈单峰曲线;物种丰富度与地上生物量呈正相关关系,与地下生物量和总生物量呈显著负相关关系(P<0.05,物种丰富度与生物量的关系呈单峰曲线。关键词:草地群落;生物量;物种丰富度;海拔梯度---本文于网络，仅供参考，勿照抄，如有侵权请联系删除---:Q948.158;S812.8文献标识码:A:100720435(20100320160207ChangesofBiomassandSpeciesRichnessofGrasslandCommunityalonganAltitudeGradientinHongchiba,ChongqingSONGLu2lu1,2,FAN激ang2wen13,ZHONGHua2ping1,WANGNing1,2(1.InstituteofGeographicSciencesandNaturalResourcesResearch,ChineseAcademyofSciences,Bei激ng100101,China;2.GraduateSchool,ChineseAcademyofSciences,Bei激ng100049,ChinaAbstract:Itisoneofhotresearchestostudythecharacteristicsandfunctionofecologicalsystemsalongdifferentaltitudegradientsbecausethealtitudegradientprovidestheperfectexperimentalconditionsforstudyingtheresponseofecologicalsystemstodifferentenvironmentalfactors.Recently,manyscholarscarriedoutplentyofexperimentstoclarifytherelationshipbetweenthespeciesdiversityandecosystemfunctionaccordingtothedynamicsofthespeciesrichnessandbiomassalongaltitudegradient.However,theresultswerenotconsistentfromtheexperimentsindifferentareasandmoreexperimentsshouldbeem2ployedatdifferentscalestodiscussthecharacteristicsofspeciesrichnessandcommunitybiomass.TheHongchibaareaofChongqingwaschosenastheinvestigatedsubjectand14samplingplotswereselecteda2longthealtitudegradient.Thedynamiccharacteristicsofspeciesrichnessandbiomassalongthealtitudegradientwereclarifiedbasedonthemeasurementsofabovegroundbiomassandbelowgroundbiomassusingharvestmethodandsoilaugermethodandthenumbersofthespeciesineachplot.Theresultsshowthattheabovegroundbiomassdecreasedbutundergroundbiomassandroottoshootratioincreasedalongwiththeincreasingaltitudegradient.BiomassofGramineaespeciesandforbsshowedextremelynegativecorre2lationswithaltitudegradientsbutnosignificantcorrelationforCompositaespecies.Speciesrichnesswasnegativelycorrelatedwithaltitudegradientin---本文于网络，仅供参考，勿照抄，如有侵权请联系删除---apatternofunimodalcurveandpositivelycorrelatedwithabovegroundbiomassbutextremelynegativelywithundergroundbiomassandtotalbiomass.Aunimodalcurverelationshipwasdetectedbetweenspeciesrichnessandbiomass.Keywords:Grasslandcommunity;Biomass;Speciesrichness;Altitudegradient环境因子对陆地植物的生长、植物区系的组成、植物群落的分布乃至生态系统的功能都有制约性的影响,不同的环境因子及其组合都对应着相应的植物、植物区系和生态系统[1]。由于海拔梯度引起温度、水分、土壤肥力和干扰程度等环境要素发生变化,为生态系统功能对环境因子响应的特征研究提供了理想的试验条件。物种丰富度(Speciesrichness与群落生物量收稿日期:2009207223;修回日期:2010201221基金项目:“”十一五国家科技支撑计划(2006BAD16B07资助作者简介:宋璐璐(19852,...